bibcock



- 2 SheetsSl1eet 2. DE VAL OIS ST. JOHN. HARROW.

(No Model.)

H. 1). BABOOOK &

Patented June 9, 1896" UNITED STATES PATENT Fries.

HENRY D. BABCOOKQXND DE VALOIS ST. JOHN, OF LEONARDSYILLE, NElV YORK,ASSIGNORS TO THE STANDARD IIARROV (lOllilPANY, OF UTICA, NEW roan. p

HABROW.

SPECIFICATION forming part of LettersPatent No. 561,643, dated June 9,1896.

' Application filed December 6,1894. Serial No. 531,070. (No model) T02% whom) it may concern: inner face of the vertical web portion of eachBe it known that we, HENRY D. BABCOCK part of the bar. In the notchesare placed and DE VALOIS ST. JOHN, of Leonardsville, in spiked teeth 6,which are securely clamped the countyof Madison and State of NewYork,together and to the parts of the bar by bolts 5 have invented certainnew and useful lm- 7. The cross-bars pass through openings 3 provementsin Harroi s; and we do hereby dein the deep vertical webs of thedraft-bars. clarc that the following is a full, clear, and There is alsolocated in each openingon each exact description of the invention, whichwill. side of the cross-bar a bearing-piece S, haw enable others skilledin the art to which it aping a groove 8, adapted to receive the web of6o pertains to make and use the same, reference the draft-bar. Thepieces 8 are secured to' being had to the accompanying drawings, and thecrossbar by being provided with a proto the letters and figures ofreference marked jecting teat S on the flat back side, which enthereon,which form part of this specification. gages in a suitable hole orindentation of the Our invention relates to an improvement cross-bar. 65in barrows. In setting up the harrow the parts of the In the drawingswhich accompany and form cross-bars are slipped through the openings apart of this specification, and in which simiin the draft-bars, and apiece 8 is slipped in lar letters and figures of reference refer tocoron either side, as shown in Fig. i, when the responding parts in theseveral views, Figbars are spread or separated as far as the size 70 2oure1showsaperspectiveviewofourimproved 0f the opening in the draft-barwill permit harrow. Fig. ishowsaplan view of aslightlyand the teeth areinserted between the parts modified form of construct-ion. Fig. 3 showsof the crossbar, holding them separated suffia portion of one of thecrossbars in connecciently to maintain all the parts in their retionwith a cross-section of one of the draftspective places. 75 bars. Fig.ishows aportion of the draft-bar On each of the several cross-bars areproand the cross-bar on a cross-section, together vided adjusting armsor levers 9 in the folwith the bearings of the cross-bar. Fig. 5 lowingmanner: Immediately on the cross-bar shows a plan View of the partsshown in Fig. 3. is provided a sleeve 9, having a substantially Figs. 6,(3, G and 6 show details of a bearsquare opening to receive the bar andprevent 8c ing'piece used in the harrow. Fig. 7 shows the same beingrotated therein. Means may a tooth-adjusting lever from the side, inconalso be provided for preventing the sleeve 9' nection with thecross-section of the cross from sliding laterally on the bar. The basebars. Fig. 8 shows an edge view of the same. end of the arm 0 isprovided with a large open- Fig. 9 shows details relating to theteeth-ading, as shown at 9 for the reception of the S5 5 justingmechanism. Fig. 10 shows a perspecend of the sleeve 9, and is alsoprovided with tive view of the adjusting-levershown in Figs. slottedopenings in the nature of key-seats, 7 and S. Fig. 11 shows one of theparts of as shown (t W, which permit the eye to be the adjusting-levermechanism disconnected placed on or removed from the end of the from theother parts. Fig. 12 shows a modisleeve when the key-seat groove 9registers 0 tied form of construction of crossbars. with the projectionsfl on the end of: the

The harrow, as shown, consists of two secsleeve. tions A and I3,although the number of sec- For limiting the swin gin g movement of thetions maybe increased or diminished at pleasarm 9 on the sleeve 9 in onedirection is proure. The sections are connected by links or vided, onthe end of the sleeve, a pair of lugs 9 5 other suitable means to anevener -bar 2. or projections 9, against which the projec- Fach sectionof the harrow consists of drafttions 9 on the arm are adapted to engage.bars 3 and rocking cross-bars a. The cross- Coiled about the sleeve 5)is provideda spring bars are composed of two bars or parts 4 and 10,secured at one end to a pin 11 on one end 4., locked or lapped together,as shown. The of the sleeve 9 and at the other hooked onto mo horizontalflanges or webs of each bar are the arm 9, as shown at 12. This spring.is notched at 5 substantiallyup to the line of the tensioned to hold thelugs or projections 9 in contact with or against the projections 9 onthe arm, and adapted to allow the tooth 6 to yield when it should strikean obstruction from the position shown in full lines in Fig. 9 to thatshown in dotted lines in the same figure. The arm on the rear rockingcrossbar is extended to form an operating leverhandle 13, and thislever-handle is connected with the several levers 9 on each of therocking cross-bars byconnecting-rod 14. On the rear end of theconnecting-rod is provided a semicircular rack 15,in which en gages acatch 16 on the lever-handle 13, securing the connecting-rod, togetherwith the several parts, in any of its positions of adjustment.

-In the modified form of construction shown in Fig. 12 crescent-shapedbars w and so are substituted for the angle-iron bars shown in theprevious figures, and the edges of the crescent shapes are notched topartially receive the tooth, as shown. In this construction theelasticity or spring of the frame-bar on its cross-section line is takenadvantage of in clamping the teeth.

The operation of this class of spike-tooth harrow is too well understoodto warrant extended description. It is sufficient to note that by theprovision of the spring 1.0 on each of the rocking cross-bars, with theset of teeth located on each, they are independently 1novable, wherebythey can free themselves when caughton such obstructions as wouldotherwise injure the harrow in case the tooth failed to become released,and the independent operation of the bars obviates any jumping orspringing of the harrow, which would take place where all the teeth ofeach section moved together, as well as reducing the amount of powerrequired to free the harrow from a fixed obstruction. All the remainingteeth of the harrow except those located on the bar of the tooth, whichmay become caught, remain at work, as usual, in any of their positionsof adjustment within the range of the adjusting mechanism provided.

What we claim as new, and desire to secure by Letters Patent, is-= Thecombination in a harrow of a rocking tooth-bar, a sleeve mounted on thebar, an adjusting-arm pivoted on the sleeve, a stop for limiting theswinging movement of the arm in one direction, and a spring coiledaround the sleeve and attached to the sleeve at one end and to the armat the other for yieldingly holding the bar, substantially as set forth.

In witness whereof we have affixed our signatures in presence of twowitnesses.

HENRY D. BABOOCK. DE VALOIS ST. JOHN.

\Vitn esses:

E. WILLARD J ONES, GEORGE O. CARTER.

